Balanced steam-valve



(No Model.)

Gr. A. KELLYl BALANGED STEAM VALVE. No. 463,156. Patented Nov/17.1891.

UNITED STATES PATENT Y OFFICE.

GEORGE A. KELLY, OE s'rILLwATEE, MINNESOTA.-

BALANCED STEAMVALVE.

SPECIFICATION forming part of Letters Patent No. 463,156, dated November 17, 1891..

Application tiled March 28, 1890x T0 a/ZZ whom it may concern.:

Be it known that I, GEORGE A. KELLY, a citizen of the United States, residing at Stillwater, in the county of Vifashington and State of Minnesota, have invented certain new and useful Improvements in Balanced Steamdfeed Valves, of which the following is a specifica* tion. 4

This invention relates to balanced steamvalves, more particularly to those used in the steam-feeding apparatus of saw-mill carriages; and it consists in the construction and attachments, as hereinafter shown and described, and specically pointed out in the claims.

In the drawings, Figure l is a longitudinal sectional elevation, and Fig. 2 is a cross-sectional View on the line X X ofFig. 1, showing one of the valves of the feeding apparatus of a saw-mill carriage with my balancing at tachment arranged therein.

A is the cylindrical casing, in which the valve B is adapted to be moved back and forth bythe stem B2.

D represents the live-steam pipe; D2, the

der; D2, the pipe leading to the opposite end of the steam-cylinder, and D4 the exhaustpipe. The live-steam pipe leads into a chamber E', which is connected by a port a to the interior of the cylindrical casing A', while the pipes D2 D3 lead into chambers E2 E3, which are connected by ports a2 a2 with the interior of the cylindrical casing. The valve B is hollow and is provided with ports a4 a5 through its sides. The exhaust-pipe D4 leads into a chamber E4, which extends in each direction ltoward the ends of the cylindrical casing A and is connected by ports a al with its interior, as shown. The ends of the cylindrical casing A are extended somewhat, and within these extensions, upon the stem B2 of the valve7 are secured piston-heads F F2, while small air pipes or ports CZ are inserted through the heads A2 A2 of the cylindrical casing or through the casing itself near its ends. IVhen the valve B is moved to the left to admitsteam into the pipe D2, the port a5 will register with the port a', and the port a2 will register with the port a4 and cover the port a6 and leave the ports a2 and a7 open for the exhaust from the pipe D3 into the interior of the casing A and thence by the ports a2 of to the chamber E4 and pipe D4. Then when the po- Seral No. 345,674. (No modell.)

sillon of the valve is reversed the port 0:4 will register with the port a', and the porton" will register with the port a2, While the ports a2 .and a will be uncovered for the free passage of the exhaust from the pipe D2 into the pipe D4. When the valve is moved, the sudden entrance of the live steam within it causes it to be moved very quickly, and frequently causes it to pound or exert an undue and powerful strain upon the stem and other parts. To overcome this tendency and to insure uniform and easy movement of the valve is the function of the piston-heads F F2, against which the exhaust-steam exerts a pressure against the live steam within the valve and counteracts its influence, so that the motion is rendered uniform and the valve perfectly balanced The piston F is inactive when the piston F2 is in operation, and vice versa. The air-pipes d prevent the air in the casing between the heads A2 A2 and the piston-heads from being compressed and interfering with the free action of the valve. The pipes d also permit the escape of any steam which may leak around the pistons.

I-Iaving thus described my invention, what I claim as new isl. The combination, with the Valve-casing having the ports opening therein from the steam-inlet chamber and the two chambers on opposite sides thereof Vwhich have communication with the steam-cylinder, and also having the chamber E4 communicating with the exhaust-pipe and with Opposite ends of the val ve-casing, of the valve having the ports a4 a5 and secured to move with the valve-A stem carrying the piston-heads F F2, substantially as and for the purposes set forth.

2. The combination', with the valve-casing having inlet and exit ports, of the valve therein having corresponding ports, the valve-stem carrying-said valve, and also piston-heads working in extended portions of the valvecasing, and air-ports in the ends of the valvecasing between said piston-heads and valvecasing heads, substantially as and for the purposes set forth.

In testimony whereof I have hereunto set my hand-in the presence of two subscribing witnesses.

GEORGE A. KELLY. Witnesses:

STILES W. BURR, C. N. WOODWAED.

IOO 

